1 #!/usr/bin/env python 2 3 """ 4 Inspect source files, obtaining details of classes and attributes. 5 6 Copyright (C) 2007, 2008, 2009, 2010, 2011 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 21 -------- 22 23 The results of inspecting a module are as follows: 24 25 Constants 26 --------- 27 28 All constants identified within the code shall be registered. 29 30 Classes 31 ------- 32 33 All global classes shall be registered; local classes (within functions) or 34 nested classes (within classes) are not currently registered. 35 36 Base classes must be detected and constant. 37 38 All classes without bases are made to inherit from __builtins__.object in order 39 to support some standard methods. 40 41 Functions 42 --------- 43 44 All functions and lambda definitions shall be registered. 45 46 Namespaces 47 ---------- 48 49 Modules define their own "global" namespace, within which classes, functions 50 and lambda definitions establish a hierarchy of namespaces. 51 52 Only local, global and built-in namespaces are recognised; closures are not 53 supported. 54 55 Assignments 56 ----------- 57 58 Name assignment and attribute assignment involving modules and classes cause 59 names to be associated with values within namespaces. 60 61 Any assignments within loops are considered to cause the targets of such 62 assignments to provide non-constant values. 63 64 Assignments to names are only really considered to cause the targets of such 65 assignments to provide constant values if the targets reside in the module 66 namespace or in class namespaces, subject to the above conditions. 67 68 Assignments to names within functions are not generally considered to cause the 69 targets of such assignments to provide constant values since functions can be 70 invoked many times with different inputs. This affects particularly the 71 definition of functions or lambdas within functions. However, there may be 72 benefits in considering a local to be constant within a single invocation. 73 """ 74 75 from micropython.common import * 76 from micropython.data import * 77 import compiler.ast 78 79 # Program visitors. 80 81 class InspectedModule(ASTVisitor, Module): 82 83 """ 84 An inspected module, providing core details via the Module superclass, but 85 capable of being used as an AST visitor. 86 """ 87 88 def __init__(self, name, importer): 89 90 """ 91 Initialise this visitor with a module 'name' and an 'importer' which is 92 used to provide access to other modules when required. 93 """ 94 95 ASTVisitor.__init__(self) 96 Module.__init__(self, name, importer) 97 self.visitor = self 98 99 # Import machinery links. 100 101 self.optimisations = self.importer.optimisations 102 self.builtins = self.importer.modules.get("__builtins__") 103 self.loaded = 0 104 105 # Current expression state. 106 107 self.expr = None 108 self.in_assignment = 0 # For slice and subscript handling. 109 110 # Namespace state. 111 112 self.in_method = 0 # Find instance attributes in all methods. 113 self.in_function = 0 # Note function presence, affecting definitions. 114 self.in_loop = 0 # Note loop "membership", affecting assignments. 115 self.namespaces = [] 116 self.functions = [] 117 118 def parse(self, filename): 119 120 "Parse the file having the given 'filename'." 121 122 module = compiler.parseFile(filename) 123 self.process(module) 124 125 def process(self, module): 126 127 "Process the given 'module'." 128 129 self.astnode = module 130 131 # Add __name__ to the namespace by adding an explicit assignment to the 132 # module. 133 134 module.node.nodes.insert(0, compiler.ast.Assign( 135 [compiler.ast.AssName("__name__", 0)], 136 compiler.ast.Const(self.full_name()) 137 )) 138 139 # First, visit module-level code, recording global names. 140 141 processed = self.dispatch(module) 142 143 # Then, for each function, detect and record globals declared in those 144 # functions. 145 146 for node, namespaces in self.functions: 147 self.process_globals(node) 148 149 self.finalise_attribute_usage() 150 151 # Then, visit each function, recording other names. 152 153 for node, namespaces in self.functions: 154 self._visitFunctionBody(node, namespaces) 155 namespaces[-1].finalise_attribute_usage() 156 157 # Add references to other modules declared using the __all__ global. 158 159 if self.has_key("__all__"): 160 all = self["__all__"] 161 if isinstance(all, compiler.ast.List): 162 for n in all.nodes: 163 self.store(n.value, self.importer.add_module(self.name + "." + n.value)) 164 165 return processed 166 167 def process_globals(self, node): 168 169 """ 170 Within the given 'node', process global declarations, adjusting the 171 module namespace. 172 """ 173 174 for n in node.getChildNodes(): 175 if isinstance(n, compiler.ast.Global): 176 for name in n.names: 177 if not self.has_key(name): 178 self[name] = None 179 else: 180 self.process_globals(n) 181 182 def vacuum(self): 183 184 """ 185 Vacuum the module namespace, removing unreferenced objects and unused 186 names. 187 """ 188 189 if self.should_optimise_unused_objects(): 190 self.vacuum_object(self) 191 192 all_objects = list(self.all_objects) 193 194 for obj in all_objects: 195 self.vacuum_object(obj) 196 197 def vacuum_object(self, obj, delete_all=0): 198 199 "Vacuum the given object 'obj'." 200 201 for name, attr in obj.items_for_vacuum(): 202 203 # Only consider deleting entire unused objects or things accessible 204 # via names which are never used. 205 206 if delete_all or not self.importer.uses_attribute(obj.full_name(), name): 207 obj.vacuum_item(name) 208 209 # Delete any unambiguous attribute value. Such values can only 210 # have been defined within the object and therefore are not 211 # redefined by other code regions. 212 213 if attr is not None and attr.assignments == 1: 214 value = attr.get_value() 215 216 # The value must have this object as a parent. 217 218 if value is not obj and value.parent is obj and value in self.all_objects: 219 self.all_objects.remove(value) 220 221 # Delete class contents and lambdas from functions. 222 223 self.vacuum_object(value, 1) 224 225 def unfinalise(self): 226 227 "Reset finalised information for the module." 228 229 for obj in self.all_objects: 230 obj.unfinalise_attributes() 231 232 def finalise(self): 233 234 "Finalise the module." 235 236 for obj in self.all_objects: 237 obj.finalise_attributes() 238 239 def add_object(self, obj, any_scope=0): 240 241 """ 242 Record 'obj' if non-local or if the optional 'any_scope' is set to a 243 true value. 244 """ 245 246 if any_scope or not (self.namespaces and isinstance(self.namespaces[-1], Function)): 247 self.all_objects.add(obj) 248 249 # Optimisation tests. 250 251 def should_optimise_unused_objects(self): 252 return "unused_objects" in self.optimisations 253 254 # Namespace methods. 255 256 def in_class(self, namespaces=None): 257 namespaces = namespaces or self.namespaces 258 return len(namespaces) > 1 and isinstance(namespaces[-2], Class) 259 260 def store(self, name, obj): 261 262 "Record attribute or local 'name', storing 'obj'." 263 264 # Store in the module. 265 266 if not self.namespaces: 267 if self.in_loop and self.used_in_scope(name, "builtins"): 268 raise InspectError("Name %r already used as a built-in." % name) 269 else: 270 self.set(name, obj, not self.in_loop) 271 272 # Or store locally. 273 274 else: 275 locals = self.namespaces[-1] 276 277 if self.in_loop and locals.used_in_scope(name, "global") and not name in locals.globals: 278 raise InspectError("Name %r already used as global." % name) 279 elif self.in_loop and locals.used_in_scope(name, "builtins"): 280 raise InspectError("Name %r already used as a built-in." % name) 281 else: 282 locals.set(name, obj, not self.in_loop) 283 284 def store_lambda(self, obj): 285 286 "Store a lambda function 'obj'." 287 288 self.add_object(obj) 289 self.get_namespace().add_lambda(obj) 290 291 def store_module_attr(self, name, module): 292 293 """ 294 Record module attribute 'name' in the given 'module' using the current 295 expression. 296 """ 297 298 module.set(name, self.expr, 0) 299 self.use_specific_attribute(module.full_name(), name) 300 301 def store_class_attr(self, name, cls): 302 303 """ 304 Record class attribute 'name' in the given class 'cls' using the current 305 expression. 306 """ 307 308 cls.set(name, self.expr, 0) 309 self.use_specific_attribute(cls.full_name(), name) 310 311 def store_instance_attr(self, name): 312 313 "Record instance attribute 'name' in the current class." 314 315 if self.in_method: 316 317 # Current namespace is the function. 318 # Previous namespace is the class. 319 320 cls = self.namespaces[-2] 321 cls.add_instance_attribute(name) 322 self.use_specific_attribute(cls.full_name(), name) 323 324 def get_namespace(self): 325 326 "Return the parent (or most recent) namespace currently exposed." 327 328 return (self.namespaces[-1:] or [self])[0] 329 330 def use_name(self, name, node=None, value=None): 331 332 """ 333 Use the given 'name' within the current namespace/unit, either in 334 conjunction with a particular object (if 'node' is specified and not 335 None) or unconditionally. 336 """ 337 338 if node is not None and isinstance(node, compiler.ast.Name): 339 self.use_attribute(node.name, name, value) 340 341 # For general name usage, declare usage of the given name from this 342 # particular unit. 343 344 else: 345 unit = self.get_namespace() 346 self.importer.use_name(name, unit.full_name(), value) 347 348 # Attribute usage methods. 349 # These are convenience methods which refer to the specific namespace's 350 # implementation of these operations. 351 352 def new_branchpoint(self, loop_node=None): 353 self.get_namespace()._new_branchpoint(loop_node) 354 355 def new_branch(self, node): 356 self.get_namespace()._new_branch(node) 357 358 def abandon_branch(self): 359 self.get_namespace()._abandon_branch() 360 361 def suspend_broken_branch(self): 362 self.get_namespace()._suspend_broken_branch() 363 364 def suspend_continuing_branch(self): 365 self.get_namespace()._suspend_continuing_branch() 366 367 def shelve_branch(self): 368 self.get_namespace()._shelve_branch() 369 370 def merge_branches(self): 371 self.get_namespace()._merge_branches() 372 373 def resume_broken_branches(self): 374 self.get_namespace()._resume_broken_branches() 375 376 def resume_continuing_branches(self): 377 self.get_namespace()._resume_continuing_branches() 378 379 def define_attribute_user(self, node): 380 381 """ 382 Define 'node' as the user of attributes, indicating the point where the 383 user is defined. 384 """ 385 386 self.get_namespace()._define_attribute_user(node) 387 388 def use_attribute(self, name, attrname, value=None): 389 390 """ 391 Note usage on the attribute user 'name' of the attribute 'attrname', 392 noting an assignment if 'value' is specified. 393 """ 394 395 return self.get_namespace()._use_attribute(name, attrname, value) 396 397 def use_specific_attribute(self, objname, attrname): 398 399 """ 400 Note usage on the object having the given 'objname' of the attribute 401 'attrname'. If 'objname' is None, the current namespace is chosen as the 402 object providing the attribute. 403 """ 404 405 return self.get_namespace()._use_specific_attribute(objname, attrname) 406 407 # Visitor methods. 408 409 def default(self, node, *args): 410 raise InspectError("Node class %r is not supported." % node.__class__) 411 412 def NOP(self, node): 413 for n in node.getChildNodes(): 414 self.dispatch(n) 415 return None 416 417 def NOP_ABANDON(self, node): 418 self.NOP(node) 419 self.abandon_branch() 420 421 def OP(self, node): 422 for n in node.getChildNodes(): 423 self.dispatch(n) 424 return Instance() 425 426 # Generic support for classes of operations. 427 428 def _ensureOperators(self): 429 attr, scope, namespace = self._get_with_scope("$operator") 430 if attr is None: 431 module = self.importer.load("operator") 432 self["$operator"] = module 433 else: 434 module = attr.get_value() 435 return module 436 437 def _visitOperator(self, node, operator_name=None): 438 439 "Accounting method for the operator 'node'." 440 441 operator_module = self._ensureOperators() 442 operator_fn = operator_functions[operator_name or node.__class__.__name__] 443 self.use_specific_attribute(operator_module.full_name(), operator_fn) 444 return self.OP(node) 445 446 _visitBinary = _visitOperator 447 _visitUnary = _visitOperator 448 449 def _visitAttr(self, expr, attrname, node): 450 451 # Attempt to identify the nature of the attribute. 452 453 if isinstance(expr, Attr): 454 value = expr.get_value() 455 456 # Get the attribute and record its usage. 457 458 if isinstance(value, (Class, Module)): 459 460 # Check for class.__class__. 461 462 if attrname == "__class__" and isinstance(value, Class): 463 attr = type_class 464 else: 465 attr = value.get(attrname) 466 self.use_specific_attribute(value.full_name(), attrname) 467 468 elif isinstance(value, UnresolvedName): 469 attr = UnresolvedName(attrname, value.full_name(), self) 470 471 else: 472 attr = None 473 474 # Note usage of the attribute where a local is involved. 475 476 self._visitAttrUser(expr, attrname, node) 477 478 elif self.builtins is not None: 479 attr = self.builtins.get(attrname) 480 self.use_specific_attribute(self.builtins.full_name(), attrname) 481 482 else: 483 attr = None 484 self.use_name(attrname, node) 485 486 return attr 487 488 def _visitAttrUser(self, expr, attrname, node, value=None): 489 490 """ 491 Note usage of the attribute provided by 'expr' with the given 'attrname' 492 where a local is involved, annotating the given 'node'. If the optional 493 'value' is given, note an assignment for future effects on attributes 494 where such attributes are inferred from the usage. 495 """ 496 497 if expr.parent is self.get_namespace(): 498 499 # NOTE: Revisiting of nodes may occur for loops. 500 501 if not hasattr(node, "_attrusers"): 502 node._attrusers = set() 503 504 node._attrusers.update(self.use_attribute(expr.name, attrname, value)) 505 node._username = expr.name 506 else: 507 self.use_name(attrname, node.expr, value) 508 509 def _visitFunction(self, node, name): 510 511 """ 512 Return a function object for the function defined by 'node' with the 513 given 'name'. If a lambda expression is being visited, 'name' should be 514 None. 515 """ 516 517 # Define the function object. 518 519 function = Function( 520 name, 521 self.get_namespace(), 522 node.argnames, 523 node.defaults, 524 (node.flags & 4 != 0), 525 (node.flags & 8 != 0), 526 self.in_loop or self.in_function, 527 self, 528 node 529 ) 530 531 self.add_object(function, any_scope=1) 532 533 # Make a back reference from the node for code generation. 534 535 node.unit = function 536 537 # Process the defaults. 538 539 for n in node.defaults: 540 self.expr = self.dispatch(n) 541 function.store_default(self.expr) 542 543 # Note attribute usage where tuple parameters are involved. 544 545 if function.tuple_parameters(): 546 self.use_name("__getitem__", node) 547 548 # Record the namespace context of the function for later processing. 549 550 self.functions.append((node, self.namespaces + [function])) 551 552 # Store the function. 553 554 if name is not None: 555 self.store(name, function) 556 else: 557 self.store_lambda(function) 558 559 # Test the defaults and assess whether an dynamic object will result. 560 561 function.make_dynamic() 562 return function 563 564 def _visitFunctionBody(self, node, namespaces): 565 566 "Enter the function." 567 568 # Current namespace is the function. 569 # Previous namespace is the class. 570 571 if self.in_class(namespaces): 572 self.in_method = 1 573 574 in_function = self.in_function 575 in_loop = self.in_loop 576 self.in_function = 1 577 self.in_loop = 0 578 579 self.namespaces = namespaces 580 self.dispatch(node.code) 581 582 self.in_loop = in_loop 583 self.in_function = in_function 584 self.in_method = 0 585 586 # Specific handler methods. 587 588 visitAdd = _visitBinary 589 590 visitAnd = OP 591 592 visitAssert = NOP 593 594 def visitAssign(self, node): 595 self.expr = self.dispatch(node.expr) 596 self.in_assignment = 1 597 for n in node.nodes: 598 self.dispatch(n) 599 self.in_assignment = 0 600 return None 601 602 def visitAssAttr(self, node): 603 expr = self.dispatch(node.expr) 604 attrname = node.attrname 605 606 # Record the attribute on the presumed target. 607 608 if isinstance(expr, Attr): 609 value = expr.get_value() 610 611 if expr.name == "self": 612 self.store_instance_attr(attrname) 613 614 elif isinstance(value, Module): 615 self.store_module_attr(attrname, value) 616 print "Warning: attribute %r of module %r set outside the module." % (node.attrname, expr.get_value().name) 617 618 elif isinstance(value, Class): 619 self.store_class_attr(attrname, value) 620 621 # Note usage of the attribute where a local is involved. 622 623 else: 624 self._visitAttrUser(expr, attrname, node, self.expr) 625 626 else: 627 self.use_name(attrname, node) 628 629 return None 630 631 def visitAssList(self, node): 632 633 # Declare names which will be used by generated code. 634 635 self.use_name("__getitem__", node) 636 637 # Process the assignment. 638 639 for i, n in enumerate(node.nodes): 640 self.dispatch(n) 641 self.importer.make_constant(i) # for __getitem__(i) at run-time 642 return None 643 644 def visitAssName(self, node): 645 if hasattr(node, "flags") and node.flags == "OP_DELETE": 646 print "Warning: deletion of attribute %r in %r is not supported." % (node.name, self.full_name()) 647 #raise InspectError("Deletion of attribute %r is not supported." % node.name) 648 649 self.store(node.name, self.expr) 650 self.define_attribute_user(node) 651 652 # Ensure the presence of the given name in this namespace. 653 654 self.use_specific_attribute(None, node.name) 655 return None 656 657 visitAssTuple = visitAssList 658 659 def visitAugAssign(self, node): 660 661 # Accounting. 662 663 operator_fn = operator_functions.get(node.op) 664 operator_module = self._ensureOperators() 665 self.use_specific_attribute(operator_module.full_name(), operator_fn) 666 667 # Process the assignment. 668 669 self.expr = self.dispatch(node.expr) 670 671 # NOTE: Similar to micropython.ast handler code. 672 # NOTE: Slices and subscripts are supported by __setitem__(slice) and 673 # NOTE: not __setslice__. 674 675 if isinstance(node.node, compiler.ast.Name): 676 self.visitAssName(node.node) 677 elif isinstance(node.node, compiler.ast.Getattr): 678 self.visitAssAttr(node.node) 679 else: 680 self.use_specific_attribute("__builtins__", "slice") 681 self.use_name("__setitem__", node) 682 683 return None 684 685 visitBackquote = OP 686 687 visitBitand = _visitBinary 688 689 visitBitor = _visitBinary 690 691 visitBitxor = _visitBinary 692 693 def visitBreak(self, node): 694 self.NOP(node) 695 self.suspend_broken_branch() 696 697 visitCallFunc = OP 698 699 def visitClass(self, node): 700 701 """ 702 Register the class at the given 'node' subject to the restrictions 703 mentioned in the module docstring. 704 """ 705 706 if self.namespaces: 707 print "Warning: class %r in %r is not global: ignored." % (node.name, self.namespaces[-1].full_name()) 708 return None 709 else: 710 if self.in_loop: 711 print "Warning: class %r in %r defined in a loop." % (node.name, self.full_name()) 712 713 cls = get_class(node.name, self.get_namespace(), self, node) 714 715 # Make a back reference from the node for code generation. 716 717 node.unit = cls 718 719 # Process base classes in the context of the class's namespace. 720 # This confines references to such classes to the class instead of 721 # the namespace in which it is defined. 722 723 self.namespaces.append(cls) 724 725 # Visit the base class expressions, attempting to find concrete 726 # definitions of classes. 727 728 for base in node.bases: 729 expr = self.dispatch(base) 730 731 # Each base class must be constant and known at compile-time. 732 733 if isinstance(expr, Attr): 734 if expr.assignments != 1: 735 raise InspectError("Base class %r for %r is not constant." % (base, cls.full_name())) 736 else: 737 cls.add_base(expr.get_value()) 738 739 # Where no expression value is available, the base class is 740 # not identifiable. 741 742 else: 743 raise InspectError("Base class %r for %r is not found: it may be hidden in some way." % (base, cls.full_name())) 744 745 # NOTE: Potentially dubious measure to permit __init__ availability. 746 # If no bases exist, adopt the 'object' class. 747 748 if not node.bases and not (self.name == "__builtins__" and node.name == "object") : 749 expr = self.dispatch(compiler.ast.Name("object")) 750 cls.add_base(expr.get_value()) 751 752 # Make an entry for the class in the parent namespace. 753 754 self.namespaces.pop() 755 self.store(node.name, cls) 756 self.add_object(cls) 757 758 # Process the class body in its own namespace. 759 760 self.namespaces.append(cls) 761 self.dispatch(node.code) 762 self.namespaces.pop() 763 764 cls.finalise_attribute_usage() 765 return cls 766 767 def visitCompare(self, node): 768 769 # Accounting. 770 # NOTE: Replicates some code in micropython.ast.visitCompare. 771 772 this_node = node 773 774 for op in node.ops: 775 op_name, next_node = op 776 777 # Define name/attribute usage. 778 # Get the applicable operation. 779 780 operator_fn = operator_functions.get(op_name) 781 782 # For operators, reference the specific function involved. 783 784 if operator_fn is not None: 785 operator_module = self._ensureOperators() 786 self.use_specific_attribute(operator_module.full_name(), operator_fn) 787 788 # Define __contains__ usage on the next node. 789 790 elif op_name.endswith("in"): 791 self.use_name("__contains__", next_node) 792 793 this_node = next_node 794 795 return self.OP(node) 796 797 def visitConst(self, node): 798 799 # Register the constant, if necessary, returning the resulting object. 800 801 self.use_name(self.importer.get_constant_type_name(node.value), node) 802 return self.importer.make_constant(node.value) 803 804 def visitContinue(self, node): 805 self.NOP(node) 806 self.suspend_continuing_branch() 807 808 visitDecorators = NOP 809 810 visitDict = OP 811 812 visitDiscard = NOP 813 814 visitDiv = _visitBinary 815 816 visitEllipsis = NOP 817 818 visitExec = NOP 819 820 visitExpression = OP 821 822 visitFloorDiv = _visitBinary 823 824 def visitFor(self, node): 825 self.new_branchpoint(node) 826 827 # Declare names which will be used by generated code. 828 829 self.use_name("__iter__", node.list) 830 self.use_name("next") 831 self.use_name("StopIteration") 832 833 in_loop = self.in_loop 834 self.in_loop = 1 835 self.dispatch(node.list) 836 self.dispatch(node.assign) 837 838 # Enter the loop. 839 # Propagate attribute usage to branches. 840 841 self.new_branch(node) 842 self.dispatch(node.body) 843 844 self.resume_continuing_branches() 845 846 self.shelve_branch() 847 848 self.in_loop = in_loop 849 850 # A null branch is used to record a path around the loop. 851 852 self.new_branch(node.else_ or NullBranch()) 853 self.shelve_branch() 854 855 self.merge_branches() 856 857 # The else clause is evaluated outside any branch. 858 859 if node.else_ is not None: 860 self.dispatch(node.else_) 861 862 # Any suspended branches from the loop can now be resumed. 863 864 self.resume_broken_branches() 865 866 return None 867 868 def visitFrom(self, node): 869 module = self.importer.load(node.modname, 1) 870 871 #if module is None: 872 # print "Warning:", node.modname, "not imported." 873 874 for name, alias in node.names: 875 if name != "*": 876 if module is not None and module.has_key(name): 877 attr = module[name] 878 self.store(alias or name, attr) 879 self.use_specific_attribute(module.full_name(), name) 880 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 881 self.importer.load(attr.get_value().name) 882 883 # Support the import of names from missing modules. 884 885 else: 886 self.store(alias or name, UnresolvedName(name, node.modname, self)) 887 else: 888 if module is not None: 889 for n in module.keys(): 890 attr = module[n] 891 self.store(n, attr) 892 self.use_specific_attribute(module.full_name(), n) 893 if isinstance(attr.get_value(), Module) and not attr.get_value().loaded: 894 self.importer.load(attr.get_value().name) 895 896 return None 897 898 def visitFunction(self, node): 899 return self._visitFunction(node, node.name) 900 901 visitGenExpr = OP 902 903 visitGenExprFor = NOP 904 905 visitGenExprIf = NOP 906 907 visitGenExprInner = NOP 908 909 def visitGetattr(self, node): 910 expr = self.dispatch(node.expr) 911 attrname = node.attrname 912 return self._visitAttr(expr, attrname, node) 913 914 def visitGlobal(self, node): 915 if self.namespaces: 916 for name in node.names: 917 ns = self.namespaces[-1] 918 if not ns.make_global(name): 919 raise InspectError("Name %r is global and local in %r" % (name, ns.full_name())) 920 921 # The name is recorded in an earlier process. 922 923 def visitIf(self, node): 924 self.new_branchpoint() 925 926 # Propagate attribute usage to branches. 927 928 for test, body in node.tests: 929 self.dispatch(test) 930 931 self.new_branch(body) 932 self.dispatch(body) 933 self.shelve_branch() 934 935 # Maintain a branch for the else clause. 936 937 self.new_branch(node.else_ or NullBranch()) 938 if node.else_ is not None: 939 self.dispatch(node.else_) 940 self.shelve_branch() 941 942 self.merge_branches() 943 return None 944 945 visitIfExp = NOP 946 947 def visitImport(self, node): 948 for name, alias in node.names: 949 if alias is not None: 950 module = self.importer.load(name, 1) or UnresolvedName(None, name, self) 951 self.store(alias, module) 952 else: 953 module = self.importer.load(name) or UnresolvedName(None, name.split(".")[0], self) 954 self.store(name.split(".")[0], module) 955 956 return None 957 958 visitInvert = _visitUnary 959 960 def visitKeyword(self, node): 961 self.dispatch(node.expr) 962 self.importer.make_constant(node.name) 963 self.keyword_names.add(node.name) 964 return None 965 966 def visitLambda(self, node): 967 fn = self._visitFunction(node, None) 968 self.use_specific_attribute(None, fn.name) 969 return fn 970 971 visitLeftShift = _visitBinary 972 973 def visitList(self, node): 974 self.use_specific_attribute("__builtins__", "list") 975 self.OP(node) 976 977 def visitListComp(self, node): 978 for qual in node.quals: 979 self.dispatch(qual) 980 self.dispatch(node.expr) 981 982 def visitListCompFor(self, node): 983 self.new_branchpoint() 984 985 # Declare names which will be used by generated code. 986 987 self.use_name("__iter__", node.list) 988 self.use_name("next") 989 990 in_loop = self.in_loop 991 self.in_loop = 1 992 self.dispatch(node.list) 993 self.dispatch(node.assign) 994 995 # Enter the loop. 996 # Propagate attribute usage to branches. 997 998 self.new_branch(node) 999 1000 for if_ in node.ifs: 1001 self.dispatch(if_) 1002 1003 self.shelve_branch() 1004 self.in_loop = in_loop 1005 1006 self.merge_branches() 1007 return None 1008 1009 visitListCompIf = NOP 1010 1011 visitMod = _visitBinary 1012 1013 def visitModule(self, node): 1014 1015 # Make a back reference from the node for code generation. 1016 1017 node.unit = self 1018 return self.dispatch(node.node) 1019 1020 visitMul = _visitBinary 1021 1022 def visitName(self, node): 1023 return self.get_namespace().get_using_node(node.name, node) 1024 1025 visitNot = OP 1026 1027 visitOr = OP 1028 1029 visitPass = NOP 1030 1031 visitPower = _visitBinary 1032 1033 def _visitPrint(self, node, function_name): 1034 self.NOP(node) 1035 self.use_specific_attribute("__builtins__", function_name) 1036 1037 def visitPrint(self, node): 1038 self._visitPrint(node, "_print") 1039 1040 def visitPrintnl(self, node): 1041 self._visitPrint(node, "_printnl") 1042 1043 visitRaise = NOP_ABANDON 1044 1045 visitReturn = NOP_ABANDON 1046 1047 visitRightShift = _visitBinary 1048 1049 def visitSlice(self, node): 1050 self._visitOperator(node, self.in_assignment and "AssSlice" or "Slice") 1051 1052 visitSliceobj = OP 1053 1054 def visitStmt(self, node): 1055 for n in node.nodes: 1056 self.dispatch(n) 1057 return None 1058 1059 visitSub = _visitBinary 1060 1061 def visitSubscript(self, node): 1062 self._visitOperator(node, self.in_assignment and "AssSubscript" or "Subscript") 1063 1064 def visitTryExcept(self, node): 1065 self.dispatch(node.body) 1066 1067 self.new_branchpoint() 1068 1069 for name, var, n in node.handlers: 1070 self.new_branch(node) 1071 1072 # Establish the local for the handler. 1073 1074 if var is not None: 1075 self.dispatch(var) 1076 if n is not None: 1077 self.dispatch(n) 1078 1079 self.shelve_branch() 1080 1081 self.new_branch(node.else_ or NullBranch()) 1082 if node.else_ is not None: 1083 self.dispatch(node.else_) 1084 self.shelve_branch() 1085 1086 self.merge_branches() 1087 return None 1088 1089 visitTryFinally = NOP 1090 1091 visitTuple = OP 1092 1093 visitUnaryAdd = _visitUnary 1094 1095 visitUnarySub = _visitUnary 1096 1097 def visitWhile(self, node): 1098 self.new_branchpoint(node) 1099 1100 # Propagate attribute usage to branches. 1101 1102 in_loop = self.in_loop 1103 self.in_loop = 1 1104 1105 # The test is evaluated initially and again in the loop. 1106 1107 self.dispatch(node.test) 1108 1109 self.new_branch(node) 1110 self.dispatch(node.body) 1111 1112 self.resume_continuing_branches() 1113 1114 self.dispatch(node.test) 1115 self.shelve_branch() 1116 1117 self.in_loop = in_loop 1118 1119 # A null branch is used to record a path around the loop. 1120 1121 self.new_branch(node.else_ or NullBranch()) 1122 self.shelve_branch() 1123 1124 self.merge_branches() 1125 1126 # The else clause is evaluated outside any branch. 1127 1128 if node.else_ is not None: 1129 self.dispatch(node.else_) 1130 1131 # Any suspended branches from the loop can now be resumed. 1132 1133 self.resume_broken_branches() 1134 1135 return None 1136 1137 visitWith = NOP 1138 1139 visitYield = NOP 1140 1141 # vim: tabstop=4 expandtab shiftwidth=4